<template>
  <div>
        <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>商品分类</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片区域 -->
    <el-card>
      <el-row>
        <el-col>
          <el-button type="primary" @click="showAddCatedialog">添加分类</el-button>

        </el-col>
      </el-row>
        <!-- 表格 -->
        <tree-table
        :data="catelist"
        :columns="columns"
        :selection-type="false"
        :expand-type="false"
        :show-index="true"
        index-text="#"
        border
        >
        <!-- 是否有效 -->
        <template slot="isok" slot-scope="scope">
          <i class="el-icon-success"
          v-if="scope.row.cat_deleted === false"
          style="color:lightgreen"
          ></i>
          <i class="el-icon-error"
          style="color:red"
          v-else></i>
        </template>
        <!-- 排序 -->
        <template slot="order" slot-scope="scope">
          <div>
            <el-tag size="mini" v-if="scope.row.cat_level===0">一级</el-tag>
            <el-tag type="success" v-else-if="scope.row.cat_level===1">二级</el-tag>
            <el-tag type="warning" v-else>三级</el-tag>
          </div>
        </template>
        <!-- 操作 -->
        <template slot="opt" slot-scope>
          <div>
            <el-button
            type="primary"
            icon="el-icon-edit"
            size="mini"
            >编辑</el-button>
            <el-button
            type="danger"
            icon="el-icon-delete"
            size="mini"
            >删除</el-button>
          </div>
        </template>
        </tree-table>

        <!-- 分页功能 -->
         <el-pagination
      @size-change="handleSizeChange"
      @current-change="handleCurrentChange"
      :current-page="querInfo.pagenum"
      :page-sizes="[3, 5, 10, 15]"
      :page-size="querInfo.pagesize"
      layout="total, sizes, prev, pager, next, jumper"
      :total="total">
    </el-pagination>
    </el-card>

    <!-- 添加对话框 -->
    <el-dialog
  title="添加分类"
  :visible.sync="addCatedialogVisible"
  width="50%"
  @close="addCateDialogClosed"
  >
  <!-- 添加分类的表单 -->
  <el-form :model="addCateForm" :rules="addCateFormRules" ref="addCateFormRef" label-width="100px" >
  <el-form-item label="分类名称:" prop="cat_name">
    <el-input v-model="addCateForm.cat_name"></el-input>
  </el-form-item>
  <el-form-item label="父级名称:" >
    <el-cascader
    v-model="selectedKeys"
    :options="parentCateList"
    @change="parentCateChanged"
    :props="cascaderProps"
    clearable
    change-on-select
    ></el-cascader>
  </el-form-item>
  </el-form>
  <!-- option指定数据源 -->
  <!-- props用来指定配置对象 -->
  <span slot="footer" class="dialog-footer">
    <el-button @click="addCatedialogVisible = false">取 消</el-button>
    <el-button type="primary" @click="addCate">确 定</el-button>
  </span>
</el-dialog>

  </div>
</template>

<script>
export default {
  data () {
    return {
      querInfo: {
        type: 3,
        pagenum: 1,
        pagesize: 5
      },
      // 商品分类的数据
      catelist: [],
      total: 0,
      // 控制对话框的显示
      addCatedialogVisible: false,
      // 树形组件数据
      columns: [
        {
          label: '分类名称',
          prop: 'cat_name'
        },
        {
          label: '是否有效',
          type: 'template',
          template: 'isok'
        },
        {
          label: '排序',
          type: 'template',
          template: 'order'
        },
        {
          label: '操作',
          type: 'template',
          template: 'opt'
        }
      ],
      // 添加表单数据的分类对象
      addCateForm: {
        // 将要添加的分类名称
        cat_name: '',
        cat_pid: 0,
        cat_level: 0
      },
      addCateFormRules: {
        cat_name: [
          { required: true, message: '请输入分类名称', trigger: 'blur' }
        ]

      },
      // 父级分类的列表数据
      parentCateList: [],
      // 指定级联选择器的配置对象
      cascaderProps: {
        value: 'cat_id',
        label: 'cat_name',
        children: 'children'
      },
      // 选中的父级分类对象
      selectedKeys: []
    }
  },
  created () {
    this.getCateList()
  },
  methods: {

    // 获取数据
    async getCateList () {
      const { data: res } = await this.$http.get('categories', { params: this.querInfo })
      if (res.meta.status !== 200) {
        return this.$message.error('获取商品分类失败')
      }

      this.catelist = res.data.result
      this.total = res.data.total
    },

    handleSizeChange (newSize) {
      this.querInfo.pagesize = newSize
      this.getCateList()
    },
    handleCurrentChange (newPage) {
      this.querInfo.pagenum = newPage
      this.getCateList()
    },
    // 控制添加分类对话框的显示
    showAddCatedialog () {
      // 获取父级分类元素
      this.getParentCateList()
      this.addCatedialogVisible = true
    },
    // 获取父级分类数据
    async  getParentCateList () {
      const { data: res } = await this.$http.get('categories', {
        params: { type: 2 }
      })

      if (res.meta.status !== 200) {
        return this.$message.error('获取父级分类失败')
      }
      this.parentCateList = res.data
    },
    // 选项发声变化触发这个函数
    parentCateChanged () {
      // 判断数组中length的长度，证明选中的父级分类
      if (this.selectedKeys.length > 0) {
        // 父级分类的id
        this.addCateForm.cat_pid = this.selectedKeys[this.selectedKeys.length - 1]
        // 当前分类的等级
        this.addCateForm.cat_level = this.selectedKeys.length
      } else {
        // 父级分类的id
        this.addCateForm.cat_pid = 0
        // 当前分类的等级
        this.addCateForm.cat_level = 0
      }
    },
    // 添加数据
    addCate () {
      this.$refs.addCateFormRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.post('categories', this.addCateForm)
        if (res.meta.status !== 201) {
          return this.$message.error('添加分类失败')
        }
        this.$message.success('添加分类成功')
        this.getCateList()
        this.addCatedialogVisible = false
      })
    },
    // 监听对话框关闭，重置数据
    addCateDialogClosed () {
      this.$refs.addCateFormRef.resetFields()
      this.selectedKeys = []
      // 父级分类的id
      this.addCateForm.cat_pid = 0
      // 当前分类的等级
      this.addCateForm.cat_level = 0
    }
  }
}

</script>

<style>
.el-button {
  margin-bottom: 20px;
}
</style>
